Flooding in Boulder started on September 12, 10 days before the event, which also includes a half marathon and 5-miler, was to start and finish at the Boulder Reservoir. On September 14, Mason announced that the race wouldn't be held on the 22nd, because municipal and other resources were needed to deal with the flooding's effects. At the time, Mason said that he hoped to announce a make-up date in the near future and wrote, "I assure you that the Boulder Marathon event will still happen this fall."

Since then, however, the long-term consequences of the flood's destruction have become more apparent, and the city of Boulder and Boulder County have said they won't host any public events for the remainder of 2013. As a result, Mason wrote, "Unfortunately, there is no other logical time to hold the event before fall 2014. Therefore, the 2014 Boulder Marathon is now to be considered the 2013/2014 Boulder Marathon event."

All 2013 registrants can transfer their entries to the 2014 race, Mason said.

The race will donate approximately $10,000 worth of food that was to have been served at the marathon to local charities that are helping with flood-relief efforts, Mason said.